David is thinking of the Rudge. It is true that it became on of the Raleigh family. (One wonders why they bothered to keep all these brands that were essentially identical.)

The Humber has five guys dancing around in a ring and sharing one big head in the chainring ... or a plainer, nondescript ring from either earlier or later.

BFer gbalke has a collection of Humbers and even more photos of exemplars owned by others. nlerner and cudak888 (is that right?) may also be able to help you ID it. Pics are best, of course.

If it looks like this, I would certainly explore avenues for acquiring it: